Figure 5From: Highly flexible method for the fabrication of photonic crystal slabs based on the selective formation of porous siliconTheoretical frequency ranges of gaps for square lattices of cylindrical air holes with different lattice parameters. The ratios r/a and h/a were set as 0.38 and 0.4, respectively. The dielectric constant of Si was set at ϵ = 11.56.Back to article page